Torque measurement

[Don.F.Broadus at ucm.com]

You are correct. I should have said make the bar 2 foot long, drill a hole
dead center,bolt it center line with the crank,  then hang the weight on the
end in the direction of torque reaction.That way the bar weight is balanced
and does not affect the over all torque. 

> -----Original Message-----
> From:	Clive Apps   Techno-Logicals   416 510 0020
> [SMTP:clive at problem.tantech.com]
> Sent:	Thursday, April 08, 1999 2:27 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: Torque measurement
> 
> > 
> > Since the motor mounts are connected to the block , you need to rotate
> the
> > block to compress the load cell not the crank.
> > The hardest part with this method is figuring out the scale in foot
> pounds.
> > Usually load cells are calibrated with certified weights hung from a
> known
> > length, usually a 1 foot long bar, hence 'foot- pound'  I don't know how
> you
> > could calculate the moment of movement that the block would place on the
> > load cell. I would guess if you bolted a 1 foot bar on the engine at the
> > center line of the crank and placed a 1 pound weight on the end of the
> bar,
> > you would be able to calibrate the load cell out put for 1 foot Lb. Of
> > course you would 
> > want to cal it to 300 ft.Lbs or what you think the engine would put out.
> If
> > you use a 2 foot bar then 1 pound on the end would apply a force of  2
> foot
> > Lbs. This would save some cal weight. Your idea is  excellent  and
> should
> > give some good results. Another way to read the torque would be to
> connect a
> > load cell to the block about where the front freeze plug is, and the
> other
> > end to the frame. This will make a solid motor mount that might damage
> the
> > Trans case if you torque it to hard. You might want to try this using
> the
> > same cal procedure, and if it works go to the mount system.     
> 
> 
> except the bar has weight
> better to place it vertical and use a scale to get the weight required
> a 5" bar and 80 lbs pull would be 400 ft lbs
> 
> Clive